Interchangeable rotors for a mastic mixer



Jan. 21, 1958 s. BOLLING INTERCHANGEABLE ROTORS FOR A MASTIC MIXER 4Sheets-Sheet 1 Filed Feb. 23, 1954 Jizpaw? B02;

'ZNV NTO ATTORNEYS Jan. 21, 1958 s. BOLLING 2,820,613

INTERCHANGEABLE ROTORS FOR A MASTIC MIXER Filed Feb. 23, 1954 4Sheets-Sheet 2 ATTORNEYS Jan. 21, 1958 I s. BOLLING 2,820,618

INTERCHANGEABLE ROTORS FOR A MASTIC MIXER Filed'Feb. 25, 1954 4Sheets-Sheet 3 fiSiedanz 30257 INVENTOR BY 7 I I ATTORNEYS.

Jan. 21, 1958 s; BOLLING 2,820,6 8

INTERCi-IANGEABLE ROTORS FOR A MASTIC MIXER Filed Feb. 23, 1954 4Sheets-Sheet 4 &}

INVENTOR.

I BY I l ATTORNEYS.

United. States Patent INTERCHANGEABLE ROTORS FOR A MASTIC MIXER StewartBolling, Cleveland, Ohio, assignor to Stewart Bolling & Company Inc.,Cleveland, Ohio Application February 23, 1954, Serial No. 411,690

1 Claim. (Cl. 259-404) This invention relates to a mastic mixing machineand more particularly to a mixing machine for rubber, plastic or othersimilar mastic material having a pair of power driven rotors soconstructed and arranged whereby a single spare rotor may be used toreplace either one of the rotors in use in the machine if and whenreplacement of a rotor becomes necessary.

It is another object of this invention to provide an easily replaceableand/or interchangeable rotor of the kind to be more particularlydescribed hereinafter for use in a mixing machine or a mill.

A further object of this invention is to provide a rotor of this kind asa practical conversion of a mixer having a long and a short rotor to amixer having two rotors of the same length with both rotors so similarthat a single rotor may be used for either one of the two rotors.

Yet a still further object of this invention is to provide a rotor foramixer or mill having two rotors operating at different speeds ofrotation with a separate motor for each rotor and a separate gear boxfor each rotor and motor whereby the use of a common gear box, ascustomarily in use, may be easily and readily avoided and the samepractical use of the different speeds of the rotors will be maintained.

A still further object of this invention is to provide two separaterotors and separate gear boxes for each rotor whereby with the continualincrease in power the large and expensive gear box for the differentialmotion connecting gears may be readily avoided and the same practicaluse and operation adhered to.

Other and further objects and advantages of the invention will behereinafter described and the novel features thereof defined in theappended claim.

In the drawings:

Fig. 1 is a top plan view of a mixer constructed according to anembodiment of my invention.

Fig. 2 is a side elevation of the mixer.

Fig. 3 is an end elevation of the mixer.

Fig. 4 is a diagrammatic top plan view, partly broken away, of themixer.

Heretofore on mixers of this kind two rollers have been required for themill or mixer and it is a purpose of this invention to provideinterchangeable rotors or rolls both and either being useable in thepresent arrangement of a long roller in the back and a shorter roller inthe front part of the device. At the present time all of the power todrive both of the rotors is transmitted through one neck and due toconditions of working surfaces, rotors and rolls are cast and notforged. Each of the rollers is provided with a flute or helix which iscast with the roller. Due to the irregular shape of the present dayrotors as well as the rotors of this invention, the rotors will also becast rather than being forged.

To overcome the objection of the added tortional strain for driving bothof the rotors, in place of the large and expensive gear box used in thepresent mills smaller 'iee and separate gear boxes and motors will beused for each of the rotors.

The mixer 10, constructed according to an embodiment of this inventionis provided with a base 11 which supports a mixer body or housing 12 andthe various motors connected thereto.

The mixer body 12 is formed with a top body section 13 and a lower orbottom body section 14 which is separable therefrom. A separation line15 denotes the line of separation between the body sections of the mixerbody 12. Each of the body sections 13 and 14 is provided with anoutwardly extending flange 16 thereon through which the bolts 17 may beengaged for securing the body sections together to form a separablemixer body as shown clearly in the drawings.

Each of the rotors is initially formed for rotation in the mixer body 12between the top and bottom body sections.

The base 11, to which the bottom body section 14 is secured, is providedwith a plurality of sockets for fastening bolts therein which bolts maybe attached to a fixed supporting base, not shown in the drawings.

Outwardly extending ears 20 are formed on the flange of each of the bodysections whereby the body sections may be detachably secured together toform the mixer body 12.

According to the teachings of the industry a pair of rotors as the frontrotor 22 and the rear rotor 21 are positioned within the mixer body androtatable therein with one end of each of the rotors extending outwardlybeyond the side walls of the mixer body. The outwardly extending end ofeach of the rotors may extend in the same direction or in oppositedirections, as clearly shown in the drawings, there being a separatemotor for each of the rotors.

Each of the rotors is provided with at least one flange 23 intermediatethe length thereof which flange is adapted to flushly engage with theinner surface of the inside of the mixer body 12, there being shown inthe drawings a flange 23 adjacent each end of the rotors.

As the rotors are cast at one time, a pair of helixes 24 or fragmentaryhelixes are also cast on each of the rotors for operative engagementwith the material in the mixer body with which the mixer 10 is to beused. The helixes of one rotor are oppositely pitched from the helixesof the other rotor and the helixes are arranged as a long helix 24 and ashort helix 24 The long helix 24 of one rotor is disposed opposite theshort helix 24 of the other rotor and the inner ends of the long helixesoverlap each other. The maximum diameter end of the long helix of onerotor is positioned to overlap a lesser diameter portion of the longhelix of the opposite rotor. This arrangement of the opposite pitchingof the helixes, with the opposite arrangement of the long and shorthelixes of one rotor relative to the other rotor, and the overlapping ofthe long helixes provides for the thorough mixing of the mastic materialand the elimination of any pockets. This arrangement of the helixesprovides continuous back and forth movement of the material togetherwith the transfer of the material from one rotor to the other.

Each helix of each rotor extends from its point of minimum diameter atthe side of the housing to its point of maximum diameter inwardly towardthe center of the housing so that the points of maximum diameter of thelong and short helix of each rotor are juxtaposed at an intermediatepoint in the housing.

One end of each of the rotors is provided with an outwardly extendingcoupling member 25 which is adapted to be coupled with a shaft of amotor also adjacent to the mixer body 12 on the base 11.

A motor 26 is attached to the base 11 outwardly of the mixer body 12,the motor 26 having a motor shaft 27 rotatable therein and extendingoutwardly therefrom err-.

to be coupled with the rotor with which it is to be drivingly engaged inthe mixer 10. a

A 'coupling'rnember 25 is adapted to couple the gears in the gear box29, through the drive shaft or gear shaft 31, to its respective rotor.

In place of the long and short rotors with their connectingdifierentialgearing connected to the rotors from a single gear box, the rotors ofthe present invention are designed to be used whereby the separatelydriven rotors, with their individual motors and driving gears, mayeasily and economically replace the older long and short rotors.

While the specific details of one embodiment of this invention have beenherein shown and described, the invention is not confined thereto aschanges and alterations may be made without departing from the spiritand scope thereof as defined in the appended claim.

I claim:

A mixer comprising a housing, a pair of parallel rotors rotatablydisposed in said housing, each rotor being formed of fragmentary helixesincluding a long helix and a short helix, the pitch of the helixes ofone rotor being oppositely disposed withrespect to the pitch of thehelixes of the other rotor, and the helixes being arranged with the longhelix of one rotor being disposed opposite the short helix of the otherrotor, the maximum diameter of .the long and short helixes on each rotorbeing juxtaposed at an intermediate point in said housing, maximumdiameter ends of the long helix of one rotor overlapping a lesserdiameter portion of the long helix of the. opposite rotor.

References Cited in the file of this patent UNITED STATES PATENTS1,324,170 :Ple'tscher et al. Dec. 9, 1919 1,355,885. Bowenet al. Oct.19,1920 1,357,217 Bowen and Schnuck Nov. 2, 1920 1,371,046 Mosher Mar.8, 1921 1,412,532 Lehman Apr. 11, 1922 1,426,984 Guldbeck Aug. 22, 19222,231,911 Hitt et a1. Feb. 18, 1941 2,458,068 Fuller J an. 4, 19492,495,241 Eaby .1 an. 24, 1950 2,559,418 Ford July 3, 1951 2,570,864Rowlson Oct. 9, 1951'

